Adjustable index for scales.



W. 1. STIMPSON.

ADJUSTABLE INDEX FOR SCALES.

APPLICATION FILED JAN.30,1911.

Patented Apr. 14, 1914.

W ffn .45 s as UNITED STATES PATENT OFFICE.

WALTER F. STIMPSON, OF DETROIT, MICHIGAN, ASSIGNOR TO GEORGE W. HURD, OF

DUNDEE, MICHIGAN.

ADJUSTABLE INDEX FOR SCALES.

Application filed January 30, 1911.

Specification of Letters Patent.

To all whom/116mm concern Be it known that I, WALTER F. STIMPsoN, acitizen of the United States of America, residing at Detroit, in thecounty of Wayne and State of Michigan, have invented certain new anduseful Improvements in Adjustable Indexes for Scales, of which thefollowing is a specification, reference being had therein to theaccompanying drawlngs.

The invention relates to scales of that type commonly known asautomatic, and in which the weighing is effected by the variabledeflection of a pendulum weight andthe cooperation of an index.

The invention consists in the'peculiar construction of parts andparticularly in the adjustable connection of the index which facilitatesand simplifies the operation of sealing the scale. I I

In the drawings,Figure 1 is a front elevation of the pendulum weight andindex of a scale constructed in accordance with my in vention; Fig. 2 isa cross section thereof; Fig. 8 is a view similar to Fig. 1 partly insection.

With scales of the type above referred to and particularly withcomputing scales, it is customary to provide an indicator such as thefan-shaped computing chart on which the computations are placed, thegraduation of the chart being uniform. This necessitates a compensatingmechanism to produce uniform angular movement of the pendulum weightwith equal increments of weight on the scale platform, and in theconstruction to which my improvements are applied, the desired result isaccomplished by a flexible band operating upon an eccentric pulley onthe pendulum arm. It is however, necessary to provide adjustments forproperly sealing the mechanism. and as heretofore constructed, thisoperation is attended with considerable difficulty. With the presentconstruction, the operation is simplified by rendering the index handadjustable independently of the adjustment of the pendulum weight, theconstruction being as follows:

A is the scale lever extending from the platform (not shown), B is thependulum weight which is supported upon knife edge pivots C and isprovided with the eccentric pulley D for engaging the flexible band Eleading to and connected with the lever A.

F is the weighing and computing chart 0; the usual fan-shaped form andwhich is provided with uniform graduations as indicated at G.

H is the index hand arranged to swing in a'path adjacent to the chartand actuated by the pendulum weight B.

To facilitate the sealing of the mechanism, the pendulum weight B isprovided with a ball I longitudinally adjustable on the pendulum arm,and there is also provided a laterally adjustable weight J engaging athreaded stem K and by which the balance may be altered. This permits ofadjustment which would change the normal position of the pendulum and bymeans of which a uniform angular movement is produced by equalincrements in weight actuating the lever A so as to correspond with thegraduations on the chart. There is however, another feature to beconsidered and that is the actual position of the index hand when thescale mechanism is in balance, which position must correspond with thezero marking on the chart. To obtain this merely by an adjustment of theball I and weight J is a. difficult operation, but by making the indexindependently angularly adjustable, the operation is greatly simplified.Thus as shown, the index H is independent of the pendulum weight B andis provided at its base with a bifurcated supporting member L havingknife edge bearings M embracing the knife edge pivots C and in alinementtherewith. These bearings M engage the same supporting bearing-blocks Nas are employed for supporting the pivot-s C, and therefore, the axis ofmovement of the index arm exactly coincides with that of the pendulumweight. For actuating the index, the arm 0 attached thereto is extendedaround the pivots and is connected at its lower end by an adjustablelink P with the lower end of the pendulum weight B. This link as shownis formed by a member having a threaded socket which is engaged by athreaded stem Q, having an operating thumb wheel R, the arrangementbeing such that by adjusting this wheel the link is lengthened orshortened, thereby producing an angular movement of the index withrespect to the pendulum weight.

With the construction as described, in

' sealing the scale the operator may first'addex on the chart, by thenadjusting the wheel R the index may be moved to stand normally at zeroand this is effected without disturbing the adjustment of the pendulumwei ht.

What I claim as my invention is:

1. In a scale, the combination of a scale lever, a pendulum weight, asupport upon which the pendulum weight is pivoted, a compensatingmechanism between said pendulum weight and said lever for producinguniform angular movement with equal increments of weight, an index armadjustable about a point in axial alinement with the pivot of thependulum weight, and means for adjusting said index arm about said pointwhereby said index arm is adjustable angularly with respect to saidpendulum weight while maintaining said uniform angular movement.

2. In a scale, the combination of a weighing lever, a pendulum weight, acompensating mechanism between said lever and pendulum weight forproducing uniform angular movement of the pendulum with equal incrementsof weight, an indicator, an index arm, a knife edge pivot for supportingsaid pendulum weight, an independent axially alined knife edge pivot forsupporting said index arm, an extension of said index arm below thefulcrum, and an adjustable connection between said extension and saidpendulum weight.

8. In a scale, the combination with a pendulum weight, of a knife edgepivot supporting said weight, an index arm, a bifurcated membersupporting said index arm embracing said pendulum pivot and having knifeedge bearings axially alined therewith,

an extension of said index around said knife edge pivot, and anadjustable connection between said extension and said pendulum weight. I

4. In a scale, the combination with a pendulum weight, of a knife edgepivot for supporting said weight, a bifurcated supporting bearing forsaid knife edge pivot, an index arm, a bifurcated member supporting saidindex arm embracing said pendulum pivot and having knife edge bearingsaxially alined therewith, said bearings being also in engagement withthe bifurcated supporting bearing for the pendulum, and an adjust-- ableconnection between said index and pendulum weight.

5. In a scale, the combination with a weighing lever, a pendulum weight,a compensating connection between said weighing lever and pendulumweight for producing uniform angular movement of the pendulum with equalincrements of weight, a laterally adjustable weight mounted on saidpendulum weight, an index arm independent of said pendulum weight andaxially alined therewith, an arm extending from said index to theopposite side of the fulcrum, and an adjustable link between said armand pendulum weight.

6. In a scale, the combination with a pendulum weight, of an index arm,and means for adjusting said index arm angularly with respect to thependulum weight comprising an adjustable link between said arm andweight.

7. In a scale, the combination with a pendulum weight, of an index armadjustable relative thereto, an arm extending from the index to theopposite side of the fulcrum thereof, and an adjustable link between thependulum and said arm for varying the angular relation of the latter tothe pendulum.

8. In a scale, the combination of a weighing lever, an index arm, asupport upon which said index arm is mounted, a pendulum weightdepending from said support, the latter being provided with a recess, athreaded stem arranged in said recessed portion, a laterally adjustableweight engaging said threaded stem, and a compensating mechanism betweensaid lever and said pendulum weight for producing uniform angularmovement of the pendulum with equal increments of weight.

In testimony whereof I aflix my signature in presence of two witnesses.

WALTER F. STIMPSON.

Witnesses:

JAMES P. BARRY, WILLIAM E. PAGEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, I). G.

